| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the thermal damage of a synthetic resin intake manifold at a connection part to be connected with an exhaust reflux tube. SOLUTION: A point part of an exhaust reflux tube 12 to be connected with an exhaust reflux tube insertion hole 11 of a synthetic resin intake manifold 1, has a double tube structure formed by an outer tube 13, and an adiabatic air layer 14 is formed on an intermediate part. A microgap 18 is kept between the outer tube 13 and an inner peripheral face of the insertion hole 11. A notch part 20 expanded in the shape of taper, is formed on an opening edge of the insertion hole 11, corresponding to the point small diameter part 13c of the outer tube 13, and a recessed part 21 is formed between the notch part 20 and the small diameter part 13c. By forming the notch part 20, the concentration of heat at an edge of the opening edge can be prevented. The turbulent flow is generated in the recessed part 21 by the flow of the intake air, thereby the point of the exhaust reflux tube 12 and the neighborhood of the taper face of the notch part are cooled.</p> |
